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From: dstroup@vnet.ibm.com (Dennis Strouphauer)
Subject: Same Code & Scripts, Results Drop From v3.0b->v3.1a->v3.1b (& 3.2a?)
Hi John,
We recently completed a design in which we used design compiler v3.0b. During
the end of the design cycle we received version 3.1a. After our design was
completed I made the upgrade (downgrade?) to version 3.1a. (This is where I
ran into some problems.) Starting with the same scripts and the same VHDL
code that was used to complete our design, I re-synthesized using version
3.1a. Naturally, I was not too thrilled when the results gave me a larger
design (area) and a MUCH slower design (slack). I called my FAE and told him
about the problem, and sent him all my scripts and VHDL code. After a few
weeks, I was told that I had to switch to version 3.1b. Well, I've made the
switch to version 3.1b and the results were better, but not as good as the
original design which was synthesized using version 3.0b. In the meantime,
I've been trying a lot of different things in version 3.1b, but I can never
seem to get the design as good as version 3.0b. And now they want me to
switch to version 3.2a....
Anyway, sorry about the long winded story. I'm just curious to know if other
Synopsys users have seen this problem and if they did, what did they do?
- Dennis Strouphauer
IBM Corporation
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